Variable | Controls | Cases | p values | |
---|---|---|---|---|
Age | N | 981 | 980 | |
Median (IQR) | 57 (53–61) | 59 (51–68) | p = 0.0004a | |
Age at menarche | N | 972 | 962 | |
Median (IQR) | 13 (12–14) | 13 (12–14) | p = 0.83a | |
Age at menopause | N | 537 | 517 | |
Median (IQR) | 50 (47–52) | 50(46–52) | p = 0.62a | |
Age at first pregnancy | N | 878 | 807 | |
Median (IQR) | 23 (20–26) | 24 (21–27) | p = 0.000001a | |
Parity | N | 981 | 980 | |
Median (IQR) | 2 (2–3) | 2(1–3) | p = 0.01a | |
Menopausal status | N | 981 | 978 | |
post | 679 (69.2%) | 653 (66.8%) | ||
pre | 302 (30.8%) | 325 (33.2%) | p = 0.25b | |
Family history of breast cancer | N | 981 | 980 | |
Yes | 101 (10.3%) | 142 (14.5%) | ||
No | 880 (89.7%) | 838 (85.5%) | p = 0.005b |